Oil-paper　insulation　high-voltage　bushings　are　one　of　the　most　important　power　equipment　in　substations,　and　their　insulation　status　is　critical　to　the　safety　and　the　stabilization　of　the　power　system　operation.　During　the　production　and　operation,　the　bushing　may　be　dampened　because　of　the　insufficient　drying　and　impregnation　or　the　intrusion　of　external　moisture,　which　leads　to　the　deterioration　of　oil　paper　insulation　and　threatens　the　reliability　of　bushing.　Due　to　the　special　insulation　structure　of　the　bushing　capacitor　core,　the　distribution　of　moisture　inside　the　bushing　is　usually　non-uniform,　especially　when　the　moisture　is　intruded　from　the　external　environment.　In　this　paper,　a　numerical　simulation　model　of　dual-unit　laminated　oil-paper　and　110kV　capacitor　bushing　is　established.　Then　the　frequency　domain　dielectric　spectrum　(FDS)　characteristics　of　oil-paper　insulation　with　different　non-uniform　moisture　distribution　are　obtained　by　simulation.　Different　types　of　non-uniform　moisture　distribution　include:　non-uniform　moisture　distribution　in　different　directions　of　the　bushing,　and　different　degrees　of　non-uniform　moisture　distribution.　When　the　non-uniform　moisture　distribution　of　bushing　is　along　the　axial　direction,　different　degrees　of　non-uniformity　of　moisture　distribution　have　little　effect　on　the　FDS　results;　when　the　non-uniform　moisture　distribution　of　bushing　is　along　the　radial　direction,　the　\{tan}\delta-f　curve　shows　a　clear　dielectric　loss　peak,　the　characteristics　of　which　are　closely　related　to　the　degree　of　non-uniformity　of　the　moisture　distribution.　Partial　damping　at　the　outermost　side　of　the　bushing　or　the　end　screen　are　more　common　in　practice,　and　the　FDS　results　of　these　two　different　types　of　damped　bushing　show　different　characteristic.　This　paper　carried　out　a　comprehensive　FDS　simulation　study　of　different　types　of　non-uniform　dampened　oil-paper　insulation,　which　is　of　great　significance　for　the　evaluation　of　the　insulation　status　of　the　oil-paper　bushing.　©　2020　IEEE.